13. Mississippi River at Clinton, Iowa.

14. Mississippi River, at Clinton, Iowa.

15. POWER SPECTRUM OF DAILY FLOWS
> 10 years
1 year
6 months

16. Post-1940 minus Pre-1940 Variables Daily Flow Monthly Precip. Monthly
Temps.

17. Phase (solid) And Amplitude (dashed) Of monthly average
St.Dev. Of
Monthly
Average
Annual
Cycle
Phase (solid)
And
Amplitude (dashed)
Of monthly average
Flows, Mississippi,
Clinton, Iowa.
Semi-Annual
Cycle
Phase of Annual
Cycles of Precip. (solid)
and Temps. (dashed

18. RECONSTRUCTED FLOW CHARACTERISTICS
(solid) and (dashed).
Standard
Deviates
of Mean
Annual
Flow

19. CHANGING PROBABILITIES OF DATES OF MAXIMUM AND MINIMUM FLOWS.
Heavy = All
Light = post-1940
Dots = Pre-1940
Post
Pre
Jun
Jul
Apr-May
Oct-Nov
Pre
Pre
Post
Aug-Oct
Dec
Jan-Feb